/**
   * @ref:https://www.iteye.com/blog/lixor-1190599
   */
 export function getLunarDate() {
  var self = this;
  var yearCyl,monCyl,dayCyl;
  var leapMonth = 0;
  var date = new Date('1900/1/31');
  var curDate =new Date();
  // 求出和1900年1月31日相差的天数
  var offset = parseInt( (curDate.getTime() - date.getTime()) / 86400000 );
  dayCyl = offset + 40;
  monCyl = 14;
  // 用offset减去每农历年的天数
  // 计算当天是农历第几天
  // i最终结果是农历的年份
  // offset是当年的第几天
  var iYear, daysOfYear = 0;
  for (iYear = 1900; iYear < 2050 && offset > 0; iYear++) {
    daysOfYear = self.yearDays(iYear);
    offset -= daysOfYear;
    monCyl += 12;
  }
  if (offset < 0) {
    offset += daysOfYear;
    iYear--;
    monCyl -= 12;
  }
  yearCyl = iYear - 1864;
  leapMonth = self.leapMonth(iYear); // 闰哪个月,1-12
  var leap = false; // 默认值
  // 用当年的天数offset,逐个减去每月（农历）的天数，求出当天是本月的第几天
  var iMonth, daysOfMonth = 0;
  for (iMonth = 1; iMonth < 13 && offset > 0; iMonth++) {
    // 闰月
    if (leapMonth > 0 && iMonth == (leapMonth + 1) && !leap) {
      --iMonth;
      leap = true;
      daysOfMonth = self.leapDays(iYear);
    } else
      daysOfMonth = self.monthDays(iYear, iMonth);

    offset -= daysOfMonth;
    // 解除闰月
    if (leap && iMonth == (leapMonth + 1))
      leap = false;
    if (!leap)
      monCyl++;
  } 
  // offset为0时，并且刚才计算的月份是闰月，要校正
  if (offset == 0 && leapMonth > 0 && iMonth == leapMonth + 1) {
    if (leap) {
      leap = false;
    } else {
      leap = true;
      --iMonth;
      --monCyl;
    }
  }
  // offset小于0时，也要校正
  if (offset < 0) {
    offset += daysOfMonth;
    --iMonth;
    --monCyl;
  }
  var newday = self.getChinaDayString(offset + 1);
  var newmonth = chineseNumber[iMonth - 1];
  self.setData({
    lunarDate: newmonth + '月' + newday
  })
  console.log(newmonth + '月' + newday);
}
const lunarInfo= [0x04bd8, 0x04ae0, 0x0a570, 0x054d5, 0x0d260, 0x0d950, 0x16554,
  0x056a0, 0x09ad0, 0x055d2, 0x04ae0, 0x0a5b6, 0x0a4d0, 0x0d250, 0x1d255, 0x0b540, 0x0d6a0, 0x0ada2, 0x095b0,
  0x14977, 0x04970, 0x0a4b0, 0x0b4b5, 0x06a50, 0x06d40, 0x1ab54, 0x02b60, 0x09570, 0x052f2, 0x04970, 0x06566,
  0x0d4a0, 0x0ea50, 0x06e95, 0x05ad0, 0x02b60, 0x186e3, 0x092e0, 0x1c8d7, 0x0c950, 0x0d4a0, 0x1d8a6, 0x0b550,
  0x056a0, 0x1a5b4, 0x025d0, 0x092d0, 0x0d2b2, 0x0a950, 0x0b557, 0x06ca0, 0x0b550, 0x15355, 0x04da0, 0x0a5d0,
  0x14573, 0x052d0, 0x0a9a8, 0x0e950, 0x06aa0, 0x0aea6, 0x0ab50, 0x04b60, 0x0aae4, 0x0a570, 0x05260, 0x0f263,
  0x0d950, 0x05b57, 0x056a0, 0x096d0, 0x04dd5, 0x04ad0, 0x0a4d0, 0x0d4d4, 0x0d250, 0x0d558, 0x0b540, 0x0b5a0,
  0x195a6, 0x095b0, 0x049b0, 0x0a974, 0x0a4b0, 0x0b27a, 0x06a50, 0x06d40, 0x0af46, 0x0ab60, 0x09570, 0x04af5,
  0x04970, 0x064b0, 0x074a3, 0x0ea50, 0x06b58, 0x055c0, 0x0ab60, 0x096d5, 0x092e0, 0x0c960, 0x0d954, 0x0d4a0,
  0x0da50, 0x07552, 0x056a0, 0x0abb7, 0x025d0, 0x092d0, 0x0cab5, 0x0a950, 0x0b4a0, 0x0baa4, 0x0ad50, 0x055d9,
  0x04ba0, 0x0a5b0, 0x15176, 0x052b0, 0x0a930, 0x07954, 0x06aa0, 0x0ad50, 0x05b52, 0x04b60, 0x0a6e6, 0x0a4e0,
  0x0d260, 0x0ea65, 0x0d530, 0x05aa0, 0x076a3, 0x096d0, 0x04bd7, 0x04ad0, 0x0a4d0, 0x1d0b6, 0x0d250, 0x0d520,
  0x0dd45, 0x0b5a0, 0x056d0, 0x055b2, 0x049b0, 0x0a577, 0x0a4b0, 0x0aa50, 0x1b255, 0x06d20, 0x0ada0
]
const chineseNumber=[
  "一", "二", "三", "四", "五", "六", "七", "八", "九", "十", "冬", "十二"
]

/**
   * @ref:https://www.iteye.com/blog/lixor-1190599
   */
 export function getLunarDate2() {
  var self = this;
  var yearCyl,monCyl,dayCyl;
  var leapMonth = 0;
  var date = new Date('1900/1/31');
  var curDate =new Date();
  // 求出和1900年1月31日相差的天数
  var offset = parseInt( (curDate.getTime() - date.getTime()) / 86400000 );
  dayCyl = offset + 40;
  monCyl = 14;
  // 用offset减去每农历年的天数
  // 计算当天是农历第几天
  // i最终结果是农历的年份
  // offset是当年的第几天
  var iYear, daysOfYear = 0;
  for (iYear = 1900; iYear < 2050 && offset > 0; iYear++) {
    daysOfYear = self.yearDays(iYear);
    offset -= daysOfYear;
    monCyl += 12;
  }
  if (offset < 0) {
    offset += daysOfYear;
    iYear--;
    monCyl -= 12;
  }
  yearCyl = iYear - 1864;
  leapMonth = self.leapMonth(iYear); // 闰哪个月,1-12
  var leap = false; // 默认值
  // 用当年的天数offset,逐个减去每月（农历）的天数，求出当天是本月的第几天
  var iMonth, daysOfMonth = 0;
  for (iMonth = 1; iMonth < 13 && offset > 0; iMonth++) {
    // 闰月
    if (leapMonth > 0 && iMonth == (leapMonth + 1) && !leap) {
      --iMonth;
      leap = true;
      daysOfMonth = self.leapDays(iYear);
    } else
      daysOfMonth = self.monthDays(iYear, iMonth);

    offset -= daysOfMonth;
    // 解除闰月
    if (leap && iMonth == (leapMonth + 1))
      leap = false;
    if (!leap)
      monCyl++;
  } 
  // offset为0时，并且刚才计算的月份是闰月，要校正
  if (offset == 0 && leapMonth > 0 && iMonth == leapMonth + 1) {
    if (leap) {
      leap = false;
    } else {
      leap = true;
      --iMonth;
      --monCyl;
    }
  }
  // offset小于0时，也要校正
  if (offset < 0) {
    offset += daysOfMonth;
    --iMonth;
    --monCyl;
  }
  var newday = self.getChinaDayString(offset + 1);
  var newmonth = self.state.chineseNumber[iMonth - 1];
  // self.setData({
  //   lunarDate: newmonth + '月' + newday
  // })
  console.log(newmonth + '月' + newday);
}
export function yearDays (y) {
  var self = this;
  var i, sum = 348;
  for (i = 0x8000; i > 0x8; i >>= 1) {
    if ((lunarInfo[y - 1900] & i) != 0)
      sum += 1;
  }
  return (sum + self.leapDays(y));
}
export function leapDays(y){
  var self = this;
  if (self.leapMonth(y) != 0) {
    if ((lunarInfo[y - 1900] & 0x10000) != 0)
      return 30;
    else
      return 29;
  } else
    return 0;
}
export function leapMonth(y) {
  var self = this;
  return lunarInfo[y - 1900] & 0xf;
}
export function monthDays(y,m){
  if ((this.state.lunarInfo[y - 1900] & (0x10000 >> m)) == 0)
    return 29;
  else
    return 30;
}
export function getChinaDayString(day){
  var self = this;
  var chineseTen = [ "初", "十", "廿", "卅"];
  var n = day % 10 == 0 ? 9 : day % 10 - 1;
  if (day > 30)
    return "";
  if (day == 10)
    return "初十";
  else
   return chineseTen[parseInt(day/10)] + chineseNumber[n];
}
